Pump jack



Jan. 19, 1943.

J. T. PHIPPS PUMP JACK Filed NOVL 17, 1941 /4 7 22 I @I f6 72 (n 0 1 I '11 4 L \7 a E/ V 4 a 3nr entor T HOP .SJ-

Patented Jan. 19, 1943 PUMP JACK John T. Phipps, Huntington Park, Calif., assignor to H. C. Smith Oil Tool Co., Compton, Calif., a corporation of California Application November 17, 1941, Serial No. 419,383

1 Claim.

This invention relates to oil well apparatus and specifically to an improved type of pump jack.

The ordinary pump jack incorporates a walking beam adapted to actuate the polish rod, and suitable means for rocking the beam, which includes a counter-balance weight for the pumping tools.

The present invention does away with the necessity of using counter-balance weights, and incorporates in place thereof a spring counterbalance.

The invention has for an object the provision of an improved pump jack providing novel features of construction, in that it is readily adjustable for different weights of pumping equipment, not wasteful of power, eficient, durable, and generally superior to pumping jacks now known to the inventor.

With the above mentioned and other objects in view, the invention consists in the novel and useful provision, formation, construction, association, and relative arrangement of parts, members and features, all as shown in one embodiment in the accompanying drawing, described generally, and more particularly pointed out in the claim.

In the drawing:

Figure 1 is a plan view of the improved pumping jack, and,

Figure 2 is a sectional view on the line 2-2 of Figure 1.

Referring to the drawing, the pumping jack incorporates the usual Samson post which, in the present instance, is of the frame type, and indicated at I. The Samson post in turn has mounted thereon a walking beam 2, through the medium of a saddle bearing 3. The supporting frame for the Samson post comprises a pair of spaced, substantially parallel members 4 and 5, the frame of said Samson post being secured thereto in any approved manner, such as by bolts, as indicated generally at 6. Brace members 1 and 8 extend between the frames 4 and 5.

As is usual practice, the outer end of the walking beam is provided with an are or mule head 9, to which is secured the polish rod by means II. An engine l2, mounted on suitable sills l3 between the frames 4 and 5, is adapted to drive a continuous belt M, the belt in turn driving gears in a gear box l5. A shaft 16 extended from opposite sides of said gear box carries cranks l1 and 18. The cranks in turn have secured thereto pitmen l9 and 20, which in turn are pivotally secured to a cross arm 2|. The cross arm is centered on and secured to the walking beam 2. As is usual practice, the crank arms are provided with openings, such as indicated at 22, to provide for adjustable throw of the pitmen.

Ordinarily, a counter-balance weight is provided for the walking beam and usually is secured to the crank. However, in the present instance, I provide a construction which has been found to be, in practice, superior to counterbalance weights. Within the base frames 4 and 6 are coiled springs 23 and 24. Cables 25 and 26 are passed axially through the coils of said springs and secured to end pieces, designated generally as 21. The end pieces or pistons 21 are movable within the frame members. Fixed blocks 28 are secured within the frame members and provided with central openings through which the cables may pass. The frames, in each instance, are slotted at 29 and provided with grooved Wheels 30, the cables being passed around said grooved wheels and secured to turnbuckles 3| which in turn are rockingly secured to a cross member 32, which in turn is secured to the walking beam in any suitable manner, as by the means 33.

The operation, uses and advantages of the invention are as follows:

When the counter-balance weights are used. it is evident that the size of the bearings necessary to support said counter-balance weights must be enlarged, and furthermore, that it requires a certain amount of extra power in case of a motor, to revolve this weight. In the present instance, the turnbuckles 3| are so adiusted that the coil springs are compressed sufficiently to counter-balance the weight of the pump rods. Thus, the actual expenditure of power is that necessary to rock the walking beam. This structure, therefore, results in a saving of power, the engine may be of low horse-power, and other parts reduced in weight, with an appreciable saving in the cost of manufacture.

The base frames may be tubular, as shown, or of any cross section, although it is contemplated that some type of guiding means is provided for the coil springs, and for the members 21, to which the cables are secured.

The device facilitates a nice adjustment of balance for different weights of pump rods. The ordinary counter-balance weight does not permit ready adjustment at the place of use, without the necessityof moving either the walking beam, or certain of the bearings for actuating the beam, that is, varying the leverage. As stated, this adjustment may be taken care of through the turnbuckles 3|.

I claim:

In a pump jack, the combination of a pair of spaced-apart and substantially parallel tubular frames, a Samson post secured between said frames, a Walking beam rockably mounted on said Samson post, said walking beam having a long and a short arm, the short arm of said beam being secured to a pump string, and'gmeans secured to the long armfor balancing the weight of said pump string; said means comprising: a

coiled compression spring within each tubular supporting frame, means for anchoring one end it a of each coil spring within a tubular frame, a

slide within each tubular frame:v and. engaging: 1

the opposite end of a coil spring, a cable in each tubular frame and positioned axially of the coils of each spring and secured to the slide at one end, a pulley for each tubular frame positioned adjacent the anchoring means for the coiled spring, a cross bar secured to the outer end of the long arm of the Walking beam, said cables passed around said pulleys and; secured at endsof said cross arm;- and means positioned between the Samson post and the means for balancing the weight of said pump string for rocking the walking beam.

JOHN T. PHIPPS. 

